Common Weakness Enumeration
CWE-124
AllowedBuffer Underwrite ('Buffer Underflow')
Abstraction: Base · Status: Incomplete
The product writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer.
45 vulnerabilities reference this CWE, most recent first.
CVE-2026-26204 (GCVE-0-2026-26204)
Vulnerability from cvelistv5 – Published: 2026-04-29 17:43 – Updated: 2026-04-30 12:48
VLAI
EPSS
VEX
Title
Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData
Summary
Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 1.0.0 to before version 4.14.4, a heap-based out-of-bounds WRITE occurs in GetAlertData, resulting in writing a NULL byte exactly 1 byte before the start of the buffer allocated by strdup. Due to unsigned integer underflow and pointer arithmetic wrapping, the write lands at offset -1 from the buffer, corrupting heap metadata. A malicious actor can potentially leverage this issue through a compromised agent to cause denial of service or heap corruption by injecting a specially crafted alert into the alerts log file monitored by wazuh-logcollector. This issue has been patched in version 4.14.4.
Severity
4.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-30 12:48 UTC
CWE
Assigner
GitHub_M
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/wazuh/wazuh/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/wazuh/wazuh/releases/tag/v4.14.4 | x_refsource_MISC |
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CVE-2026-26199 (GCVE-0-2026-26199)
Vulnerability from cvelistv5 – Published: 2026-07-20 14:59 – Updated: 2026-07-20 18:56
VLAI
EPSS
VEX
Title
Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zero
Summary
HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If `H5Iget_name` is invoked on a group id with `0` for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if `H5Iget_name` is invoked in a way where `size` can be forced to zero, and there is important data before the `name` buffer.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 18:56 UTC
CWE
- CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
GitHub_M
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/HDFGroup/hdf5/security/advisor… | x_refsource_CONFIRM |
| https://github.com/HDFGroup/hdf5/blob/develop/src… | x_refsource_MISC |
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CVE-2026-20104 (GCVE-0-2026-20104)
Vulnerability from cvelistv5 – Published: 2026-03-25 16:05 – Updated: 2026-03-26 17:39
VLAI
EPSS
VEX
Summary
A vulnerability in the bootloader of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches, Cisco Catalyst ESS9300 Embedded Series Switches, Cisco Catalyst IE9310 and IE9320 Rugged Series Switches, and Cisco IE3500 and IE3505 Rugged Series Switches could allow an authenticated, local attacker with level-15 privileges or an unauthenticated attacker with physical access to an affected device to execute arbitrary code at boot time and break the chain of trust.
This vulnerability is due to insufficient validation of software at boot time. An attacker could exploit this vulnerability by manipulating the loaded binaries on an affected device to bypass some of the integrity checks that are performed during the boot process. A successful exploit could allow the attacker to execute code that bypasses the requirement to run Cisco-signed images.
Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates because this vulnerability allows an attacker to bypass a major security feature of a device.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-26 17:39 UTC
CWE
- CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
cisco
CNA
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco IOS XE Software |
Affected:
16.12.8
Affected: 16.12.6 Affected: 16.12.6a Affected: 16.12.7 Affected: 17.3.3 Affected: 17.3.4 Affected: 17.3.5 Affected: 17.3.6 Affected: 17.3.4b Affected: 17.3.7 Affected: 17.3.8 Affected: 17.3.8a Affected: 17.4.1 Affected: 17.5.1 Affected: 17.6.1 Affected: 17.6.2 Affected: 17.6.3 Affected: 17.6.1y Affected: 17.6.4 Affected: 17.6.5 Affected: 17.6.6 Affected: 17.6.6a Affected: 17.6.5a Affected: 17.6.7 Affected: 17.6.8 Affected: 17.7.1 Affected: 17.7.1a Affected: 17.10.1 Affected: 17.8.1 Affected: 17.8.1a Affected: 17.9.1 Affected: 17.9.2 Affected: 17.9.1a Affected: 17.9.3 Affected: 17.9.4 Affected: 17.9.5 Affected: 17.9.4a Affected: 17.9.5b Affected: 17.9.6 Affected: 17.9.6a Affected: 17.9.7 Affected: 17.9.8 Affected: 17.11.1 Affected: 17.12.1 Affected: 17.12.2 Affected: 17.12.3 Affected: 17.12.4 Affected: 17.12.5 Affected: 17.12.6 Affected: 17.13.1 Affected: 17.14.1 Affected: 17.15.1 Affected: 17.15.2 Affected: 17.15.3 Affected: 17.15.4 Affected: 17.16.1 Affected: 17.17.1 Affected: 17.18.1 Affected: 17.18.2 |
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CVE-2026-16439 (GCVE-0-2026-16439)
Vulnerability from cvelistv5 – Published: 2026-07-21 17:28 – Updated: 2026-07-22 18:27
VLAI
EPSS
VEX
Title
Eclipse OpenJ9 : Using -Xtrace to trace method arguments can lead to buffer underflow
Summary
In Eclipse OpenJ9 versions up to 0.60, using -Xtrace to trace method arguments can lead to buffer underflow.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 18:15 UTC
CWE
- CWE-124 - Buffer underwrite ('buffer underflow')
Assigner
eclipse
CNA
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Eclipse Foundation | OpenJ9 |
Affected:
0.8.0 , < 0.60.0
(custom)
Unaffected: 0 , < 0.8.0 (custom) Unaffected: 0.60.0 (custom) |
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CVE-2026-16179 (GCVE-0-2026-16179)
Vulnerability from cvelistv5 – Published: 2026-10-08 13:06 – Updated: 2026-10-08 14:06
VLAI
EPSS
VEX
Title
IBM DataPower Gateway Buffer Underwrite
Summary
IBM DataPower Gateway 10.5.0.0 through 10.5.0.22, 10.6.1 through 10.6.6, 10.6.0.0 through 10.6.0.10, and 11.0.0.0 through 11.0.0.2 could allow an attacker to cause a heap buffer underwrite and potentially crash the service.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 14:06 UTC
CWE
- CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
ibm
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7289775 | vendor-advisorypatch |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | DataPower Gateway 10.6CD |
Affected:
10.6.1 , ≤ 10.6.6
(semver)
cpe:2.3:a:ibm:datapower_gateway_106cd:10.6.1:*:*:*:*:*:*:* cpe:2.3:a:ibm:datapower_gateway_106cd:10.6.6:*:*:*:*:*:*:* |
|
| IBM | DataPower Gateway 10.6.0 |
Affected:
10.6.0.0 , ≤ 10.6.0.10
(semver)
cpe:2.3:a:ibm:datapower_gateway_1060:10.6.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:datapower_gateway_1060:10.6.0.10:*:*:*:*:*:*:* |
|
| IBM | DataPower Gateway 11.0.0 |
Affected:
11.0.0.0 , ≤ 11.0.0.2
(semver)
cpe:2.3:a:ibm:datapower_gateway_1100:11.0.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:datapower_gateway_1100:11.0.0.2:*:*:*:*:*:*:* |
|
| IBM | DataPower Gateway 10.5.0 |
Affected:
10.5.0.0 , ≤ 10.5.0.22
(semver)
cpe:2.3:a:ibm:datapower_gateway_1050:10.5.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:datapower_gateway_1050:10.5.0.22:*:*:*:*:*:*:* |
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CVE-2026-12538 (GCVE-0-2026-12538)
Vulnerability from cvelistv5 – Published: 2026-11-04 20:25 – Updated: 2026-11-09 20:52
VLAI
EPSS
VEX
Title
IBM MQ Appliance is affected by an improper validation vulnerability
Summary
IBM MQ 9.4.0.0 to 9.4.0.26, 9.4.1.0 to 9.4.5.3, and 10.0.0.1 to 10.0.0.5 could allow an authenticated attacker to obtain sensitive information or cause a denial of service due to improper validation of message header structure length fields.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 20:52 UTC
CWE
- CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
ibm
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7293035 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | MQ Appliance |
Affected:
9.4.0.0 , ≤ 9.4.0.26
(semver)
Affected: 9.4.1.0 , ≤ 9.4.5.3 (semver) Affected: 10.0.0.1 , ≤ 10.0.0.5 (semver) cpe:2.3:a:ibm:mq_appliance:9.4:*:*:*:*:*:*:* cpe:2.3:a:ibm:mq_appliance:9.4.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:mq_appliance:9.4.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:mq_appliance:9.4.1.0:*:*:*:*:*:*:* |
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CVE-2026-5089 (GCVE-0-2026-5089)
Vulnerability from cvelistv5 – Published: 2026-05-12 16:14 – Updated: 2026-05-14 13:51
VLAI
EPSS
VEX
Title
YAML::Syck versions before 1.38 for Perl has an out-of-bounds read
Summary
YAML::Syck versions before 1.38 for Perl has an out-of-bounds read.
The base60 (sexagesimal) parsing code in perl_syck.h has a buffer underflow bug in both int#base60 and float#base60 handlers. When processing the leftmost segment of a colon-separated value (e.g., the 1 in 1:30:45), the inner while loop can decrement a pointer past the start of the string buffer:
while ( colon >= ptr && *colon != ':' )
{
colon--;
}
if ( *colon == ':' ) *colon = '\0'; // colon may be ptr-1 here
When no colon is found (final/leftmost segment), colon becomes ptr-1, and the subsequent *colon dereference reads one byte before the allocated buffer.
Severity
7.3 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-14 13:50 UTC
CWE
- CWE-124 - Buffer Underwrite ('Buffer Underflow')
Assigner
CPANSec
CNA
References
5 references
| URL | Tags |
|---|---|
| https://metacpan.org/release/TODDR/YAML-Syck-1.38… | release-notes |
| https://github.com/cpan-authors/YAML-Syck/issues/132 | issue-tracking |
| https://github.com/cpan-authors/YAML-Syck/pull/133 | issue-tracking |
| https://github.com/cpan-authors/YAML-Syck/commit/… | patch |
| http://www.openwall.com/lists/oss-security/2026/0… |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| TODDR | YAML::Syck |
Affected:
0 , < 1.38
(custom)
|
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CVE-2026-1485 (GCVE-0-2026-1485)
Vulnerability from cvelistv5 – Published: 2026-01-27 13:43 – Updated: 2026-11-06 17:53
VLAI
EPSS
VEX
Title
Glib: glib: local denial of service via buffer underflow in content type parsing
Summary
A flaw was found in Glib's content type parsing logic. This buffer underflow vulnerability occurs because the length of a header line is stored in a signed integer, which can lead to integer wraparound for very large inputs. This results in pointer underflow and out-of-bounds memory access. Exploitation requires a local user to install or process a specially crafted treemagic file, which can lead to local denial of service or application instability.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-27 14:39 UTC
CWE
- CWE-124 - Buffer Underwrite
Assigner
redhat
CNA
References
3 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-1485 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2433325 | issue-trackingx_refsource_REDHAT |
| https://gitlab.gnome.org/GNOME/glib/-/issues/3871 |
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/a:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:rhel_els:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:rhel_els:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/a:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/a:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai
|
Date Public
2026-01-27 00:00
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CVE-2026-0966 (GCVE-0-2026-0966)
Vulnerability from cvelistv5 – Published: 2026-03-26 20:06 – Updated: 2026-11-05 16:11
VLAI
EPSS
VEX
Title
Libssh: libssh: denial of service via zero-length input in ssh_get_hexa()
Summary
A flaw was found in libssh. The API function `ssh_get_hexa()` is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI (Generic Security Service Application Program Interface) authentication if the server's logging verbosity is set to `SSH_LOG_PACKET (3)` or higher. Successful exploitation could lead to a self-Denial of Service of the per-connection daemon process.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-27 19:52 UTC
CWE
- CWE-124 - Buffer Underwrite
Assigner
redhat
CNA
References
6 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:18160 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:18683 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:7067 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-0966 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2433121 | issue-trackingx_refsource_REDHAT |
| https://www.libssh.org/2026/02/10/libssh-0-12-0-a… |
Impacted products
8 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:0.12.0-2.el10 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:0.10.4-18.el9 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/o:redhat:enterprise_linux:9::baseos |
|
| Red Hat | Red Hat Hardened Images |
Unaffected:
0.12.0-1.1.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:rhel_els:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:rhel_els:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/a:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
Date Public
2026-02-10 18:47
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CVE-2025-68114 (GCVE-0-2025-68114)
Vulnerability from cvelistv5 – Published: 2025-12-17 21:14 – Updated: 2025-12-18 15:09
VLAI
EPSS
VEX
Title
Capstone doesn't check vsnprintf return in SStream_concat, allows stack buffer underflow and overflow
Summary
Capstone is a disassembly framework. In versions 6.0.0-Alpha5 and prior, an unchecked vsnprintf return in SStream_concat lets a malicious cs_opt_mem.vsnprintf drive SStream’s index negative or past the end, leading to a stack buffer underflow/overflow when the next write occurs. Commit 2c7797182a1618be12017d7d41e0b6581d5d529e fixes the issue.
Severity
4.8 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-18 14:55 UTC
CWE
Assigner
GitHub_M
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/capstone-engine/capstone/secur… | x_refsource_CONFIRM |
| https://github.com/capstone-engine/capstone/commi… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| capstone-engine | capstone |
Affected:
<= 6.0.0-Alpha5
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Mitigation
Requirements
Choose a language that is not susceptible to these issues.
Mitigation
Implementation
All calculated values that are used as index or for pointer arithmetic should be validated to ensure that they are within an expected range.
No CAPEC attack patterns related to this CWE.